The Bidens – who are booster vaccinated – covered their faces for no apparent reason as they crossed the White House grounds after disembarking Marine One.

It is not clear who the President, 79, or the First Lady, 70, were protecting or who they felt they needed protection from as the only people walking across the grounds.

When the couple walked closer to the White House, members of the secret sevice and the press were seen nearer, within a couple of yards, however the risk of infection given they were outdoors was negligible.

It comes just months after the Bidens were pictured wearing face masks on a deserted Rehoboth Beach in Delaware while walking their German Shepherd puppy, Commander.